/*
 * CodePress - Real Time Syntax Highlighting Editor written in JavaScript - http://codepress.org/
 * 
 * Copyright (C) 2007 Fernando M.A.d.S. <fermads@gmail.com>
 *
 * Contributors :
 *
 * 	Michael Hurni <michael.hurni@gmail.com>
 *
 * This program is free software; you can redistribute it and/or modify it under the terms of the 
 * GNU Lesser General Public License as published by the Free Software Foundation.
 * 
 * Read the full licence: http://www.opensource.org/licenses/lgpl-license.php
 */
CodePress = {
    scrolling : false,
    autocomplete : true,
    initialize : function() {
        if(typeof(editor)=='undefined' && !arguments[0]) return;
        chars = '|32|46|62|';
        cc = '\u2009';
        editor = document.getElementsByTagName('pre')[0];
        editor.contentEditable = 'true';
        document.getElementsByTagName('body')[0].onfocus = function() {
            editor.focus();
        }
        document.attachEvent('onkeydown', this.metaHandler);
        document.attachEvent('onkeypress', this.keyHandler);
        window.attachEvent('onscroll', function() {
            if(!CodePress.scrolling) setTimeout(function(){
                CodePress.syntaxHighlight('scroll')
            },1)
        });
        completeChars = this.getCompleteChars();
        setTimeout(function() {
            window.scroll(0,0)
        },50);
    },
	
    keyHandler : function(evt) {
        charCode = evt.keyCode;
        if(completeChars.indexOf('|'+String.fromCharCode(charCode)+'|')!=-1 && CodePress.autocomplete) {
            CodePress.complete(String.fromCharCode(charCode))
        }
        else if(chars.indexOf('|'+charCode+'|')!=-1||charCode==13) {
            CodePress.syntaxHighlight('generic');
        }
    },

    metaHandler : function(evt) {
        keyCode = evt.keyCode;
		
        if(keyCode==9 || evt.tabKey) {
            CodePress.snippets();
        }
        else if((keyCode==122||keyCode==121||keyCode==90) && evt.ctrlKey) {
            (keyCode==121||evt.shiftKey) ? CodePress.actions.redo() :  CodePress.actions.undo();
            evt.returnValue = false;
        }
        else if(keyCode==34||keyCode==33) {
            self.scrollBy(0, (keyCode==34) ? 200 : -200);
            evt.returnValue = false;
        }
        else if(keyCode==46||keyCode==8) {
            CodePress.actions.history[CodePress.actions.next()] = editor.innerHTML;
        }
        else if((evt.ctrlKey || evt.metaKey) && evt.shiftKey && keyCode!=90)  {
            CodePress.shortcuts(keyCode);
            evt.returnValue = false;
        }
        else if(keyCode==86 && evt.ctrlKey)  {
            window.clipboardData.setData('Text',window.clipboardData.getData('Text').replace(/\t/g,'\u2008'));
            top.setTimeout(function(){
                CodePress.syntaxHighlight('paste');
            },10);
        }
        else if(keyCode==67 && evt.ctrlKey)  {
    }
    },

    findString : function() {
        range = self.document.body.createTextRange();
        if(range.findText(cc)){
            range.select();
            range.text = '';
        }
    },
	
    split : function(code,flag) {
        if(flag=='scroll') {
            this.scrolling = true;
            return code;
        }
        else {
            this.scrolling = false;
            mid = code.indexOf(cc);
            if(mid-2000<0) {
                ini=0;end=4000;
            }
            else if(mid+2000>code.length) {
                ini=code.length-4000;end=code.length;
            }
            else {
                ini=mid-2000;end=mid+2000;
            }
            code = code.substring(ini,end);
            return code.substring(code.indexOf('<P>'),code.lastIndexOf('</P>')+4);
        }
    },
    syntaxHighlight : function(flag) {
        if(flag!='init') document.selection.createRange().text = cc;
        o = editor.innerHTML;
        if(flag=='paste') { // fix pasted text
            o = o.replace(/<BR>/g,'\r\n');
            o = o.replace(/\u2008/g,'\t');
        }
        o = o.replace(/<P>/g,'\n');
        o = o.replace(/<\/P>/g,'\r');
        o = o.replace(/<.*?>/g,'');
        o = o.replace(/&nbsp;/g,'');
        o = '<PRE><P>'+o+'</P></PRE>';
        o = o.replace(/\n\r/g,'<P></P>');
        o = o.replace(/\n/g,'<P>');
        o = o.replace(/\r/g,'<\/P>');
        o = o.replace(/<P>(<P>)+/,'<P>');
        o = o.replace(/<\/P>(<\/P>)+/,'</P>');
        o = o.replace(/<P><\/P>/g,'<P><BR/></P>');
        x = z = this.split(o,flag);

        if(arguments[1]&&arguments[2]) x = x.replace(arguments[1],arguments[2]);
	
        for(i=0;i<Language.syntax.length;i++)
            x = x.replace(Language.syntax[i].input,Language.syntax[i].output);
			
        editor.innerHTML = this.actions.history[this.actions.next()] = (flag=='scroll') ? x : o.replace(z,x);
        if(flag!='init') this.findString();
    },

    snippets : function(evt) {
        var snippets = Language.snippets;
        var trigger = this.getLastWord();
        for (var i=0; i<snippets.length; i++) {
            if(snippets[i].input == trigger) {
                var content = snippets[i].output.replace(/</g,'&lt;');
                content = content.replace(/>/g,'&gt;');
                if(content.indexOf('$0')<0) content += cc;
                else content = content.replace(/\$0/,cc);
                content = content.replace(/\n/g,'</P><P>');
                var pattern = new RegExp(trigger+cc,"gi");
                this.syntaxHighlight('snippets',pattern,content);
            }
        }
    },
	
    readOnly : function() {
        editor.contentEditable = (arguments[0]) ? 'false' : 'true';
    },
	
    complete : function(trigger) {
        var complete = Language.complete;
        for (var i=0; i<complete.length; i++) {
            if(complete[i].input == trigger) {
                var pattern = new RegExp('\\'+trigger+cc);
                var content = complete[i].output.replace(/\$0/g,cc);
                setTimeout(function () {
                    CodePress.syntaxHighlight('complete',pattern,content)
                },0); // wait for char to appear on screen
            }
        }
    },
	
    getCompleteChars : function() {
        var cChars = '';
        for(var i=0;i<Language.complete.length;i++)
            cChars += '|'+Language.complete[i].input;
        return cChars+'|';
    },

    shortcuts : function() {
        var cCode = arguments[0];
        if(cCode==13) cCode = '[enter]';
        else if(cCode==32) cCode = '[space]';
        else cCode = '['+String.fromCharCode(keyCode).toLowerCase()+']';
        for(var i=0;i<Language.shortcuts.length;i++)
            if(Language.shortcuts[i].input == cCode)
                this.insertCode(Language.shortcuts[i].output,false);
    },
	
    getLastWord : function() {
        var rangeAndCaret = CodePress.getRangeAndCaret();
        words = rangeAndCaret[0].substring(rangeAndCaret[1]-40,rangeAndCaret[1]);
        words = words.replace(/[\s\n\r\);\W]/g,'\n').split('\n');
        return words[words.length-1].replace(/[\W]/gi,'').toLowerCase();
    },

    getRangeAndCaret : function() {
        var range = document.selection.createRange();
        var caret = Math.abs(range.moveStart('character', -1000000)+1);
        range = this.getCode();
        range = range.replace(/\n\r/gi,'  ');
        range = range.replace(/\n/gi,'');
        return [range.toString(),caret];
    },
	
    insertCode : function(code,replaceCursorBefore) {
        var repdeb = '';
        var repfin = '';
		
        if(replaceCursorBefore) {
            repfin = code;
        }
        else {
            repdeb = code;
        }
		
        if(typeof document.selection != 'undefined') {
            var range = document.selection.createRange();
            range.text = repdeb + repfin;
            range = document.selection.createRange();
            range.move('character', -repfin.length);
            range.select();
        }
    },

    getCode : function() {
        var code = editor.innerHTML;
        code = code.replace(/<br>/g,'\n');
        code = code.replace(/<\/p>/gi,'\r');
        code = code.replace(/<p>/i,''); // IE first line fix
        code = code.replace(/<p>/gi,'\n');
        code = code.replace(/&nbsp;/gi,'');
        code = code.replace(/\u2009/g,'');
        code = code.replace(/<.*?>/g,'');
        code = code.replace(/&lt;/g,'<');
        code = code.replace(/&gt;/g,'>');
        code = code.replace(/&amp;/gi,'&');
        return code;
    },

    setCode : function() {
        var code = arguments[0];
        code = code.replace(/\u2009/gi,'');
        code = code.replace(/&/gi,'&amp;');
        code = code.replace(/</g,'&lt;');
        code = code.replace(/>/g,'&gt;');
        editor.innerHTML = '<pre>'+code+'</pre>';
    },

    actions : {
        pos : -1,
        history : [],
        undo : function() {
            if(editor.innerHTML.indexOf(cc)==-1){
                document.selection.createRange().text = cc;
                this.history[this.pos] = editor.innerHTML;
            }
            this.pos--;
            if(typeof(this.history[this.pos])=='undefined') this.pos++;
            editor.innerHTML = this.history[this.pos];
            CodePress.findString();
        },
		
        redo : function() {
            this.pos++;
            if(typeof(this.history[this.pos])=='undefined') this.pos--;
            editor.innerHTML = this.history[this.pos];
            CodePress.findString();
        },
		
        next : function() {
            if(this.pos>20) this.history[this.pos-21] = undefined;
            return ++this.pos;
        }
    }
}

Language={};
window.attachEvent('onload', function() { 
    CodePress.initialize('new');
});